Multiple-spindle machine tool

ABSTRACT

An automatic multiple-spindle bar or chucking machine wherein the carrier for work spindles is indexible in an upright support of the machine frame and has a side face beyond which the work supporting ends of the spindles extend. The side face of the support mounts several cross slides movable by cams separably mounted on auxiliary shafts which are journalled in the support and are rotated by an endless chain which is driven by a control shaft mounted in the support at a level above the carrier. The auxiliary shafts transmit motion to rotary, reciprocable and oscillatable additional shafts which extend beyond the side face of the support and can transmit motion o special attachments.

[ Sept. 5, 1972 United States Patent Ledergerber 7/1957Nichta....................29/38 B X [54] MULTIPLE-SPINDLE MACHINE TOOL[72] Inventor: Alfred Ledergerber, Bielefeld, Ger-Schubert......................82/3 X .29/38.4

many

[73] Assignee: Werkzeugmaschinenfabrik Le Boeut...................

Gildemeister Co. & AKT-GES, Bielefeld, Germany Primary Examiner-AndrewR. Juhasz Assistant ExaminerZ. R. Bilinsky Att0rneyMichael S. Striker[22] Filed: April 28, 1970 [21] Appl. N0.: 32,621

ABSTRACT An automatic multiple-spindle bar or chucking Related US.Application Data [62] Division of Ser. No. 671,691

machine wherein the carrier for work spindles is in- P 1967- dexible inan upright support of the machine frame and has a side face beyond whichthe work supporting Foreign Application Priority Data ends of thespindles extend. The side face of the sup- OCt. 5, 1966 Germanywmwwmw42520 port mounts several cross slides movable by cams separably mountedon auxiliary shafts which are journalled in the support and are rotatedby an endless chain which is driven by a control shaft mounted in thesupport at a level above the carrier. The auxiliary B B 2H2 898 s Dun 8Mm m8 3 n./ "9 "m2 Tm L Mr C d 1mm UIF 1:1] 2 8 555 shafts transmitmotion to rotary, reciprocable and oscillatable additional shafts whichextend beyond the [56] References Cited UNITED STATES PATENTS side faceof the support and can transmit motion 0 special attachments.

2,788,565 4/1957 Kohring.....................29/57 X 8 Claims, 11Drawing Figures MULTIPLE-SPINDLE MACHINE TOOL CROSS-REFERENCE TO RELATEDAPPLICATION This is a division of my copending application, Ser. No.671,691 filed Sept. 29, 1967.

BACKGROUND OF THE INVENTION The present invention relates to machinetools in general, and more particularly to improvements inmultiple-spindle machine tools. Still more particularly, the inventionrelates to horizontal chucking or bar machines with an indexible carrierfor a set of work spindles which are suited for treatment of workpiecesin rapid sequence with short dwells between successive indexingmovements of the spindle carrier.

Presently known multiple-spindle chucking or bar machines normallycomprise a frame which defines a completely enclosed work andtool-accommodating space, particularly as seen in the longitudinaldirection of the machine. The power train which drives the work spindlesis very long and the prime mover for the spindles is remote from thespindles; as a rule, the prime mover is located at that side of theframe which faces away from the aforementioned space. The power trainincludes a main drive shaft which extends through the spindle carrierand supports the main tool slide. The cross slides receive motion fromthe prime mover for the spindles through a system of cams, links, leversand rods. The frames of the just described conventional machines arerather sturdy because their parts fully enclose the work andtool-accommodating space; however, such sturdiness is achieved at theexpense of accessibility to the working stations and reduces the volumeof the aforementioned space. This presents several problems if themachine is to use plural attachments and particularly as regards rapidinsertion, interchange or replacement to tools, tool holders, slides,cams and/or workpieces. Furthermore, there is little room for controlledand rapid evacuation of shavings which are removed from workpieces.Moreover, the fact that the power train between the work spindles andthe prime mover is very long also creates a number of problems becausethe parts of the power train are likely to vibrate, to produce excessivenoise and to undergo excessive wear if they must be started and arrestedat frequent and rapidly following intervals prior and subsequent torapid acceleration to a high speed which is necessary in rapid treatmentof workpieces The inertia of cross slides, top slides and otherrelatively heavy parts which receive motion during each stage of aworking cycle also contributes to undesirable wear and prevents accuratemachining of workpieces at rapidly following intervals. Also, theinertia of heavy parts affects the control shaft which transmits motionto special attachments and other motion receiving devices in amultiple-spindle chucking or bar machine.

SUMMARY OF THE INVENTION One of the objects of my invention is toprovide a multiple-spindle machine tool with a system of drives andmotion transmitting units whose inertia is small so that they cantransmit motion at frequent intervals and permit rapid accelerationand/or deceleration of driven parts.

Another object of the invention is to provide a novel frame for amultiple-spindle machine and to construct and assemble the essential andoptional parts of the machine in such a way that they can be readilyreached, inspected, cleaned, interchanged and/or removed with littleloss in time.

An additional object of my invention is to provide a multiple-spindlemachine tool which is particularly suited for short-lasting treatment ofextruded or pressformed workpieces and wherein the removal of shavingsdoes not interfere with accessibility and/or operation of various toolsor attachments.

A concomitant object of the invention is to provide simple andlightweight auxiliary drives for attachments which receive rotary,reciprocatory, oscillatory and/or other motion from the main controlshaft of a multiplespindle bar or chucking machine and to assemble suchauxiliary drives from a small number of parts.

My invention is embodied in a multiple-spindle machine tool and drivecomprises a frame including an upright support or column one side faceof which is adjacent to the work and tool-accommodating space, anindexible carrier rotatably mounted in the support, a plurality of workspindles rotatably mounted in the carrier and having work-supportingportions adjacent to the side face of the support, a plurality of crossslides and/or other attachments mounted on the frame adjacent to theside face of the support, a driven control shaft mounted in the frameand preferably located above and parallel to the work spindles, anddrive means for operating the attachments including a plurality ofauxiliary shafts rotatably mounted in the support in parallelism withthe control shaft, means for rotating the auxiliary shafts insynchronism with the control shaft, and cams or analogous motiontransmitting means each separably mounted on one of the auxiliary shaftsand each arranged to operate one of the attachments in response torotation of the respective auxiliary shaft.

The novel features which are considered as characteristic of theinvention are set forth in particular in the appended claims. Theimproved machine tool itself, however, both as to its construction andits mode of operation, together with additional features and advantagesthereof, will be best understood upon perusal of the following detaileddescription of certain specific embodiments with reference to theaccompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of amultiple-spindle machine tool which embodies one form of my invention, aportion of the frame being broken away directly above thework-accommodating space;

FIG. 2 is an end elevational view of the machine tool as seen from theleft-hand side of FIG. 1 and illustrates certain components of the drivefor the work spindles;

FIG. 3 is a diagrammatic side elevational view of the drive for the workspindles;

FIG. 4 is an end elevational view of the support with cross and topslides;

FIG. 5 is a horizontal sectional view of the support as seen in thedirection of arrows from the line V-V of FIG. 4, showing two types ofdrives for additional shafts;

FIG. 6 is a fragmentary sectional view of a third drive for anadditional shaft;

FIG. 7 is a similar fragmentary sectional view of a fourth drive for anadditional shaft which can be used to transmit motion to a heavy topslide;

FIG. 8 is an enlarged horizontal sectional view of a detail of themachine tool shown in F IG. 1;

FIG. 9 is a fragmentary sectional view of the structure shown in FIG. 2;

FIG. 10 is an enlarged end elevational view of an attachment which isconnected to an overhanging portion of the frame, the view being takenin the direction of the arrow X shown in FIG. 1; and

FIG. 11 is a section as seen in the direction of arrows from the lineXI-XI of FIG. 10.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIGS. 1 and2, there is shown an automatic multiple-spindle machine tool whichcomprises a frame F including a casting l forming a base or bed andsupporting an upright hollow support or headstock 2 which accommodates arotary indexible carrier 3 for six equidistant work spindles 5. Themount 4 for the power train of the drive for the spindles 5 in thecarrier 3 is bolted to or integral with that side of the headstock 2which faces away from the working stations. This insures that thecarrier 3 and spindles 5 can be indexed and rotated by a very shortpower train. The prime mover 6 of the drive is preferably an electricmotor which is mounted on the bed 1 and transmits motion through a beltdrive 7, a transmission including a gear train having gears 8 to 15 inthe mount 4 (see particularly FIG. 3) and a planetary including a sunwheel 16 and planet pinions 17. The pairs of meshing gears 10, 11 and12, 13 are readily accessible and replaceable to change the transmissionratio.

The machine tool further comprises one or more cross slides, for exampletwo cross slides 18, 18a, which receive motion in a manner asillustrated in FIGS. 4 and 5. A driven horizontal main camshaft orcontrol shaft 19 which receives motion from the motor 6 and is mountedin the frame F at a level above the carrier 3 is provided with a drivergear 20 which drives a torque transmitting element here shown as anendless chain 22. This chain can be replaced by a ring gear (not shown)surrounding the spindle carrier 3 and in mesh with the driver gear 20.The chain 22 can be tensioned by means of two tensioning rolls 20amounted on the headstock 2 and movable radially with reference to theaxis of the carrier 3. The chain 22 is trained around driven gears 23which are affixed to secondary camshafts or auxiliary shafts 24 for thecross slides and each of which preferably comprises the same number ofteeth as the driver gear 20. Each auxiliary shaft 24 carries a separableand exchangeable motion transmitting cam 25 serving to transmit motionto a cross slide. The cross slides 18, 18a are of different design (seeFIG. 1) so that each thereof can carry one or more different toolholders for material removing tools. These cross slides are exchangeableand can be mounted at different locations, i.e., adjacent to thework-supporting ends of selected spindles 5. FIG. 4 shows a total of sixcross and top slides, including the cross slides 18, 18a and fouradditional cross slides 18d,

but the number of these cross slides can be less, depending on thedesired number of operations to which the workpieces are to be subjectedduring a complete cycle. The cross slide 18a is flat and is designed toreceive and to retain a tool holder at one of its ends, i.e., adjacentto the work-supporting end of the respective spindle 5. The cross slide18 is L-shaped and is designed to carry tool holders at severaldistances from the work-supporting end of the adjoining spindle 5. Othertypes of cross slides can be employed with equal advantage and each ofthe illustrated cross slides can switch positions with any one of theother five cross and top slides.

As shown in FIG. 5, the control shaft 19 can further transmit motion toone or more attachments. One of the auxiliary shafts 24 carries acylindrical cam 29 provided with an endless peripheral cam groove 30which receives a roller follower 3] installed in a bearing member 31awhich is affixed to a reciprocable additional shaft 32 mounted in theheadstock 2. When the control shaft 19 drives the gear 20, it alsodrives the cam 29 whereby the follower 31 causes the additional shaft 32to move back and forth and to operate an attachment 132 whose operationnecessitates a reciprocatory movement. An arm 33 holds the shaft 32against rotational movement. The right-hand end portion of the shaft 32extends beyond the right-hand side face of the headstock 2.

The auxiliary shaft 24 shown in the lower part of FIG. 5 carries adriver gear 26 meshing with a driven gear 27 on a further additionalshaft 28 which transmits rotary motion to another attachment 232. Sincethe gear 23 on the shaft 24 has the same number of teeth as the drivergear 20 on the control shaft 19, the additional shaft 28 can be rotatedat the same speed as the control shaft, at a higher speed or at a lowerspeed but always proportionally to the speed of the control shaft. It isclear that the gear 26 can be mounted directly on the control shaft 19,that the cam 29 can be mounted on the control shaft, or that each of theshafts 19, 24 can carry a cam or gear to transmit motion to a suitableattachment. The right-hand end portion of the additional shaft 28extends beyond the right-hand side face of the headstock 2.

FIG. 6 shows that an auxiliary shaft 24 can also support a face cam 34having an endless cam groove 35 machined into one of its end faces andaccommodating a roller follower 36 mounted on an arm 37 which is affixedto an additional shaft 38 serving to rock or oscillate a furtherattachment 332 (indicated by phantom lines). Thus, the control shaft 19and/or one or more shafts 24 can operate attachments (132, 232, 332)which require rotary, reciprocatory and/or pivotal movement for theiroperation. The three motion transmitting structures of FIGS. 5 and 6 canbe installed in a fully assembled machine tool having the basic designof FIG. 1 or they may be permanently or removably or exchangeablyinstalled during initial assembly of the machine tool. Thus, the cams29, 34 and the gear 26 can be removed or interchanged so that eachattachment can be installed in any one of several possible positions toremove material from successive workpieces at one of the six workingstations adjacent to the illustrated end of the carrier 3 shown inFIG. 1. The dimensions (or at least the diameters) of the additionalshafts 32, 28, 38 are preferably identical so that each thereof can beinstalled in either one of several sets of hearings or journals providedtherefor in or on the headstock 2. One end portion of the additionalshaft 38 extends from the headstock and can be separably coupled to theattachment 332.

A relatively heavy top slide or cross slide 45 (see FIG. 7) which can beused to carry a tool holder for tools which remove material fromworkpieces held in one of the two uppermost spindles 5 shown in FIG. 1can receive motion from an auxiliary drive which includes a rotary facecam 39 having an endless cam groove 40 for a roller follower 41 mountedon a twoarmed lever 42 having a toothed segment 43. The top slide 45 ismounted on an elongated overhanging extension or arm 21 which is boltedto or is integral with the headstock 2 and extends above the space S forthe workpieces and tools. The segment 43 meshes with a rack 44 on thetop slide 45 and transmits to the latter a reciprocatory movement inresponse to oscillatory movement of the lever 42. The arm 21 can supporttwo top slides 45. The cam 39 is mounted directly on the control shaft19 which extends through the arm 21. FIG. 8 shows that the control shaft19 can carry two cams 39, one for each of the two top slides mounted onthe arm 21. However, it is clear that all of the six cross and topslides shown in FIG. 1 can be mounted on the headstock 2 and that thecams 39 can be dispensed with.

The main or longitudinal tool slide 47 of the machine tool is movable bya carriage 48 (FIG. 1) which receives motion from a cylindrical cam 49mounted on the control shaft 19 (see FIG. 8). The roller follower whichextends into the endless circumferential groove of the cam 49 and isaffixed to the carriage 48 for the main slide 47 is not shown in thedrawing. The just mentioned follower can also be affixed to a spindle(not shown) which is connected to the carriage 49 and is reciprocable inthe arm 21. Such spindle can be mounted in the arm 21 at a level abovethe slide 47 and below the cam 49. The arm 21 carries bearings 50 forthe control shaft 19 and the latters right-hand end portion extends intoa hollow bearing block 51 and carries a bevel gear 52 meshing with abevel gear 53 on a transverse horizontal second control shaft 54. Thebearing block 51 is mounted on or is integral with the free end of thearm 21. The end portions of the second control shaft 54 extend into apair of housings 56 provided on the block 51 and carry pairs of cams 55each of which can transmit motion to a further attachment (not shown).The bevel gear 52 and the parts receiving motion therefrom arepreferably removable, i.e., the entire structure shown at the left-handend of the arm 21 in FIG. 8 can be installed on an operative machine. Asa rule, the second control shaft 54 will be fully assembled with and inthe parts 51, 53, 55, 56 and such attachment can be bolted to ordetached from the arm 21.

The main slide 47 can support one or more additional attachments whichcan be operated in synchronism with the work spindles 5 or at apredetermined ratio to the speed of these spindles. FIGS. 9 to 11illustrate one of the attachments which can be mounted on the main slide47. The gear and sun wheel 16 of FIG. 3 are mounted on a hollow maindrive shaft 58 (FIG. 9) having an internally splined end portion 60adjacent to the corresponding end of the carrier 3. This splined endportion 60 can receive the externally splined end of an auxiliary shaft59 which can be inserted into a hollow cylindrical guide or sleeve 57.The latter extends axially through the carrier 3 and its other end isinstalled in the bearing block 51 (see FIG. 1 1). The right hand end ofthe auxiliary shaft 59 carries a gear 61 meshing with a gear 62 on theinput shaft 63a of an attachment 63. The casing of the attachment 63 canbe bolted to one of several facets 64 at the lower end of the bearingblock 51 (see FIG. 10). The attachment 63 may constitute a high speeddrilling or boring machine and its input member 63a may but need notrotate at the exact speed of the main drive shaft 58. The gears 61, 62are accessible to change the ratio between the shaft 59 and input member63a. It is further clear that the gears 61, 62 can be replaced by avariable-speed transmission and that the motion transmitting connectionbetween the attachment 63 and main drive shaft 58 may include one ormore clutches so that the attachment 63 can remain mounted on the frameF but is disconnected during certain types of operations. The sameapplies for the previously described attachments each of which can beprovided with a clutch and/or with a variable speed transmission.

FIG. 1 further shows a large shavings-collecting chamber 65 which isprovided in the bed 1 in the region below the work-supporting ends ofthe spindles 5 and the slides. Rapid evacuation of shavings from thechamber 65 can be effected by a suitable conveyor 66. Since the work andtool-accommodating space S (to the right of the headstock 2 as viewed inFIG. 1) is rather large and is fully open from the front side of theframe F (facing the viewer of FIG. 1) as well as from below (toward thechamber 65), the mounting or removal of special attachments, insertionor removal of tools or their holders, as well as interchange, mountingor removal of slides and the feed and evacuation of workpieces presentno problems. Moreover, the machine tool may carry an exceptionally largenumber of special attachments and/or slides without the danger ofinterference. Each attachment can receive motion through theintermediary of a relatively short and hence light power train so thatthe inertia of moving parts is relatively small.

In heretofore known multiple-spindle machine tools, the cross slides andtop slides normally receive motion through several levers, bars, pushrods, links and like devices. In my improved machine, the control shaft19 can transmit torque to the shafts 24 which move the cross slides backand forth by means of simple, lightweight and exchangeable motiontransmitting cams 25 so that the means which drive the cross slides canchange direction very rapidly and can be quickly decelerated to zerospeed or accelerated to a high speed without excessive wear, noiseand/or vibration. Since a large part of the drive for the work spindles5 is accommodated directly in the portion 4 of the headstock 2, thepower train between the prime mover 6 and the work spindles 5 is veryshort. This power train also drives the control shaft 19 and can beutilized to operate the indexing mechanism for the spindle carrier 3.The end portions of additional shafts 28, 32, 38 extend into the tooland work-accommodating space S so that they can be rapidly coupled to oruncoupled from special attachments which might be needed in connectionwith certain types of treatment. Such attachments may includeend-working attachments, threading attachments, high-speed drillingattachments, crossmilling or cross-drilling attachments, reamingattachments, and/or others.

In the appended claims, the term attachment is intended to embrace theattachments 132, 232, 332, 63, other attachments which can receivemotion from the auxiliary shafts 24, the slides 18, 18a, 180' and/orother types of slides adapted to receive motion from the shafts l9 and24.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can, by applying current knowledge,readily adapt it for various applications without omitting featureswhich fairly constitute essential characteristics of the generic andspecific aspects of my contribution to the art and, therefore suchadaptations should and are intended to be comprehended within themeaning and range of equivalence of the claims.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims:

1. In a multi-spindle machine tool, a combination comprising, a frameincluding an upright support having a side face; an indexible carrierrotatably mounted in said support; a plurality of workspindles rotatablymounted in said carrier and having supporting portions adjacent to saidside face; a plurality of attachments supported by said frame andadjacent to said side face; a driven control shaft mounted in saidframe; drive means for operating said attachments in response torotation of said control shaft, including a plurality of auxiliaryshafts rotatably mounted in said support is parallelism with saidcontrol shaft, means for rotating said auxiliary shafts in synchronismwith said control shaft, and a plurality of motion transmitting meanseach separably connected with one of said a xiliary shafts and eacharranged to operate one of said attachments in response to rotation ofthe respective auxiliary shaft; an additional shaft reciprocably mountedin said support and having a portion extending beyond said side face;and additional drive means comprising cam and follower means arranged toreciprocate said additional shaft in response to rotation of one of saidauxiliary shafts.

2. A combination as defined in claim 1, further comprising means forholding said additional shaft against rotation with reference to saidsupport.

3. A combination as defined in claim 1, wherein said cam and followermeans comprises a cylinder cam fixed to said one shaft and having anendless peripheral cam groove and a follower fixed to said additionalshaft and extending into said groove.

4. In a multi-spindle machine tool, a combination, comprising a frameincluding an upright support having a side face; an indexible carrierrotatably mounted in said support; a plurality of workspindles rotatablymounted in said carrier and having work-supporting portions adjacent tosaid side face; a plurality of attachments supported by said frame andadjacent to said side face; a driven control shaft mounted in saidframe; drive means for operating said attachments in response torotation of said control shaft, includin luralit f auxiliary shaftsrotatably mounted in s id upporf i n parallelism with said controlshaft, means for rotating said auxiliary shafts in synchronism with saidcontrol shaft, and a plurality of motion-transmitting means eachseparably connected with one of said auxiliary shafts and each arrangedto operate one of said attachments in response to rotation of therespective auxiliary shafts; an additional shaft oscillatably mounted insaid support means and having one portion extending beyond said sideface; and additional drive means comprising means for oscillating saidadditional shaft in response to rotation of one of said auxiliaryshafts.

5. A combination as defined in claim 4, wherein said means foroscillating comprises a face cam fixed to said one shaft and having anendless cam groove, and a pivotable arm secured to said additional shaftand having a follower extending into said groove.

6. In a multi-spindle machine tool, a combination comprising a frameincluding a single upright support having a side face; an indexiblecarrier mounted in said support; a plurality of workspindles rotatablymounted in said carrier and having work-supporting portions adjacent tosaid side face; a plurality of attachments supported by said frame andadjacent to said side face; a driven control shaft mounted in saidframe; drive means for operating said attachments in response torotation of said control shaft, and including a plurality of auxiliaryshafts rotatably mounted in said support in parallelism with saidcontrol shaft, means for rotating said auxiliary shafts in synchronismwith said control shaft and comprising a plurality of gears respectivelyfixedly mounted on said control shaft and said auxiliary shafts and anendless chain wound about said gears, and a plurality of motiontransmitting means each separably connected with one of said auxiliaryshafts and each arranged to operate one of said attachments in responseto rotation of the respective auxiliary shaft; an additional shaftmovably mounted in said support and having a portion extending beyondsaid side face; and additional drive means for moving said additionalshaft in response to rotation of one of said auxiliary shafts.

7. A combination as defined in claim 17, wherein said additional drivemeans includes a gear train and wherein said additional shaft isrotatable by said gear train with reference to said support in responseto rotation of said one auxiliary shaft.

8. A combination as defined in claim 7, wherein said support is hollowand said gear train is mounted in the interior of said support.

1. In a multi-spindle machine tool, a combination comprising, a frameincluding an upright support having a side face; an indexible carrierrotatably mounted in said support; a plurality of workspindles rotatablymounted in said carrier and having supporting portions adjacent to saidside face; a plurality of attachments supported by said frame andadjacent to said side face; a driven control shaft mounted in saidframe; drive means for operating said attachments in response torotation of said control shaft, including a plurality of auxiliaryshafts rotatably mounted in said support is parallelism with saidcontrol shaft, means for rotating said auxiliary shafts in synchronismwith said control shaft, and a plurality of motion transmitting meanseach separably connected with one of said a xiliary shafts and eacharranged to operate one of said attachments in response to rotation ofthe respective auxiliary shaft; an additional shaft reciprocably mountedin said support and having a portion extending beyond said side face;and additional drive means comprising cam and follower means arranged toreciprocate said additional shaft in response to rotation of one of saidauxiliary shafts.
 2. A combination as defined in claim 1, furthercomprising means for holding said additional shaft against rotation withreference to said support.
 3. A combination as defined in claim 1,wherein said cam and follower means comprises a cylinder cam fixed tosaid one shaft and having an endless peripheral cam groove and afollower fixed to said additional shaft and extending into said groove.4. In a multi-spindlE machine tool, a combination, comprising a frameincluding an upright support having a side face; an indexible carrierrotatably mounted in said support; a plurality of workspindles rotatablymounted in said carrier and having work-supporting portions adjacent tosaid side face; a plurality of attachments supported by said frame andadjacent to said side face; a driven control shaft mounted in saidframe; drive means for operating said attachments in response torotation of said control shaft, including a plurality of auxiliaryshafts rotatably mounted in said support in parallelism with saidcontrol shaft, means for rotating said auxiliary shafts in synchronismwith said control shaft, and a plurality of motion-transmitting meanseach separably connected with one of said auxiliary shafts and eacharranged to operate one of said attachments in response to rotation ofthe respective auxiliary shafts; an additional shaft oscillatablymounted in said support means and having one portion extending beyondsaid side face; and additional drive means comprising means foroscillating said additional shaft in response to rotation of one of saidauxiliary shafts.
 5. A combination as defined in claim 4, wherein saidmeans for oscillating comprises a face cam fixed to said one shaft andhaving an endless cam groove, and a pivotable arm secured to saidadditional shaft and having a follower extending into said groove.
 6. Ina multi-spindle machine tool, a combination comprising a frame includinga single upright support having a side face; an indexible carriermounted in said support; a plurality of workspindles rotatably mountedin said carrier and having work-supporting portions adjacent to saidside face; a plurality of attachments supported by said frame andadjacent to said side face; a driven control shaft mounted in saidframe; drive means for operating said attachments in response torotation of said control shaft, and including a plurality of auxiliaryshafts rotatably mounted in said support in parallelism with saidcontrol shaft, means for rotating said auxiliary shafts in synchronismwith said control shaft and comprising a plurality of gears respectivelyfixedly mounted on said control shaft and said auxiliary shafts and anendless chain wound about said gears, and a plurality of motiontransmitting means each separably connected with one of said auxiliaryshafts and each arranged to operate one of said attachments in responseto rotation of the respective auxiliary shaft; an additional shaftmovably mounted in said support and having a portion extending beyondsaid side face; and additional drive means for moving said additionalshaft in response to rotation of one of said auxiliary shafts.
 7. Acombination as defined in claim 17, wherein said additional drive meansincludes a gear train and wherein said additional shaft is rotatable bysaid gear train with reference to said support in response to rotationof said one auxiliary shaft.
 8. A combination as defined in claim 7,wherein said support is hollow and said gear train is mounted in theinterior of said support.